JP2006264209A - Manufacturing method for ink image receiving paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for ink image receiving paper, which can enhance quality such as printability, close adhesion and bendability, while ensuring the close adhesion. <P>SOLUTION: In this ink image receiving paper 100, a solid resin layer before heating expansion is formed on a base sheet 10. After the formation of the solid resin layer, an expanded-surface adjusting resin layer 14 is formed on an expanded resin layer. After the formation of the layer 14, the expanded resin layer 12 is formed by heating a heat-expanding agent in the unexpanded resin layer. After the formation of the layer 12, an ink image receiving layer 16 for receiving an ink image is formed; and a water-based emulsion-like coating, which contains a polyurethane resin component, and at least one kind of silica particulate and alumina particulate, is prepared, and applied in an application quantity of 15-35 g/m<SP>2</SP>, so as to form the ink image receiving layer 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a base sheet, a foamed resin layer formed by foaming by heating a heating foaming agent contained in the thermoplastic resin layer, a foam surface adjustment resin layer mainly composed of a thermoplastic resin, The present invention relates to a method for producing ink image receiving paper including an ink image receiving layer for receiving ink.

  Ink-receiving paper such as ink-jet paper used for printing by an ink-jet printer is known. The ink image receiving paper is used as a wallpaper for surface decoration used in, for example, the exterior and interior of buildings, joinery, furniture, and interiors of passenger cars. Such wallpaper is manufactured by printing a desired pattern on inkjet paper for wallpaper by an inkjet printer. The manufactured wallpaper is used depending on the application. Some ink-receiving paper for wallpaper or the like is manufactured by foaming / embossing as a surface treatment to form a concavo-convex pattern on the surface.

  Conventionally, as this type of wallpaper, a so-called PVC wallpaper in which a vinyl chloride resin layer is formed on a paper substrate has been widely used. However, in recent years, vinyl chloride has a problem that dioxins are likely to be generated at the time of combustion and disposal, and therefore tends to be avoided. As an alternative to this, there is a wallpaper in which an aqueous emulsion is used and an aqueous emulsion coat layer is formed.

  Patent Document 1 discloses a decorative sheet including a foaming process that has been developed by the inventor of the applicant. This decorative sheet is manufactured by previously forming an unfoamed resin layer and a resin layer on a production line such as a factory, and then foaming after applying pattern printing to form a foamed resin layer. In the invention according to this application, since the printed pattern is affected by the foaming process, the influence can be suppressed, and a good pattern can be printed even when mass-produced on a production line.

  However, at the time of filing of Patent Document 1, inkjet printers were not popular, but subsequent inkjet printers were popular. With the widespread use of this ink jet printer, there is a tendency for user needs to print a decorative sheet pattern more personally. Therefore, a new technical problem has arisen that an image is printed on the foamed resin layer of the decorative sheet by the ink jet printer in accordance with personal preference.

  As its technical problem, in the wallpaper having an aqueous emulsion coat layer formed, when an ink image receiving layer on which a pattern is printed by an ink jet printer is provided on a non-foamed aqueous emulsion coat layer and subjected to heat embossing, There is a case where there is no volume feeling and sharp embossing may not enter. Therefore, in order to prevent this point, the image printed on the water-based emulsion coat layer containing the unfoamed capsule foaming agent is heated and foamed to give embossed texture, and there is a sense of volume. A sharp emboss is formed. Ink image-receiving paper is reported in Patent Document 2 below.

  The ink image-receiving paper having a concavo-convex pattern formed on the surface described in Patent Document 2 contains a heating foaming agent in a thermoplastic resin on a backing substrate serving as a base material sheet, and the heating foaming agent is heated. A foamed resin layer formed by foaming is formed, and the ink-receiving layer is formed on the foamed resin layer, and an ink image-receiving layer that receives printing ink added from an inkjet printer during printing is formed.

Patent Document 2 discloses a method for manufacturing the ink image receiving paper. In the method for producing ink image-receiving paper described in Patent Document 2, it is disclosed that after the foamed resin layer is foamed, an uneven pattern is added by embossing or the ink image-receiving layer is formed.
JP-A-10-157045 Japanese Patent No. 3084275

  However, the ink receiving paper described in the above-mentioned Patent Document 2 may have a problem with proper printing. For example, the printed image may have a dark color tone and it may be difficult to form an image with a clear color tone.

  The inventors of the present invention invented a method for producing ink image receiving paper that can improve quality such as printability, adhesion, and bending characteristics, and filed a patent application in Japanese Patent Application No. 2004-286731.

  However, in recent years, it has been desired by users of ink image receiving paper to improve printing quality, folding characteristics, and the like, and it is necessary to further improve printing quality. The present inventor has intensively studied improvement of a process for manufacturing an ink image receiving paper that further improves quality such as printing suitability and folding characteristics, while ensuring adhesion.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for producing ink image receiving paper that can improve quality such as printing suitability and folding characteristics while ensuring adhesion.

The base sheet of the present invention, a foamed resin layer formed by foaming by heating a heating foaming agent contained in the thermoplastic resin layer, a foam surface adjusting resin layer mainly composed of a thermoplastic resin, and an ink An ink image-receiving sheet comprising an ink image-receiving layer for receiving an image, an unfoamed resin layer forming step of forming an unfoamed resin layer before heating and foaming on the base sheet, and after forming the unfoamed resin layer, A foamed surface adjusting resin layer forming step for forming the foamed surface adjusting resin layer on the non-foamed resin layer, and after forming the foamed surface adjusting resin layer, heating the foaming resin in the unfoamed resin layer to heat the foamed resin. A foamed resin layer forming step for forming a layer; and an image receiving layer forming step for forming an ink image receiving layer for receiving an image on the foamed surface adjusting resin layer after the foamed resin layer is formed. Fine particles and alumina fine And at least one of the child, to create an aqueous emulsion-like paint containing, that is coated with the aqueous emulsion-like coating with a coating weight of 15g ^/ m ² ~35g / m 2 to form the ink image-receiving layer Features.

  It is preferable to include a concavo-convex pattern layer forming step of forming a concavo-convex pattern layer by forming a concavo-convex shape at least on the surface of the foam-adjusting surface adjustment resin layer after forming the foamed resin layer and before forming the ink image receiving layer. .

  It is preferable to include an embossing process for embossing at least the surface of the foamed surface adjusting resin layer after forming the foamed resin layer and before forming the ink image receiving layer.

  It is possible to provide a method for producing an ink image receiving paper that can improve the quality of printing, folding characteristics, and the like while ensuring adhesion.

The inventors of the present invention provide a base sheet of the present invention, a foamed resin layer formed by foaming by heating a heating foaming agent contained in the thermoplastic resin layer, and a foamed surface mainly composed of a thermoplastic resin. As a result of intensive studies on suitable conditions in a method for producing an ink image-receiving paper including an adjustment resin layer and an ink image-receiving layer that receives an ink, surprisingly, the ink image-receiving layer is made of a polyurethane resin component, silica fine particles, and alumina fine particles. at least one and, to create an aqueous emulsion-like paint containing, adhesion between the aqueous emulsion-like coating with a coating weight of 15g ^/ m ² ~35g / m 2 by the formed by applying foam surface adjustment resin layer of As a result, the present inventors have found that it is possible to improve printing properness and bending characteristics while securing the properties. Absorption of the ink to form by coating with a coating weight 15g ^/ m ² ~35g / m 2 of an aqueous emulsion-like coating in the ink receiving layer is easily, also after ink printing, the ink moderately in the ink image-receiving layer surface It becomes easy to leave. If the coating amount is less than 15 g / m ² , the ink absorption is insufficient, the strength as the ink image-receiving layer is weak, and the ink image-receiving layer is cracked when the ink image-receiving paper is bent according to the application. Sometimes. If the coating amount exceeds 35 g / m ² , the ink may be absorbed too much and may remain afterward, and the color of the image received on the ink image-receiving layer may fade as a whole. Further, if the ink image receiving paper becomes too thick and the flexibility of the ink image receiving paper is lacking and bent, the ink image receiving layer often breaks.

  The aqueous emulsion paint is more preferably such that at least one of the silica fine particles and alumina fine particles has a blending ratio of 30 to 70 parts by weight with respect to 100 parts by weight of the polyurethane resin component. I also found.

  EMBODIMENT OF THE INVENTION Below, the form for inventing is demonstrated based on drawing. In addition, about this embodiment, it is only one form for implementing this invention, and this invention is not limited by this embodiment. In the present embodiment, a method for producing an inkjet ink receiving paper for wallpaper, which has a pattern and an uneven pattern for decorating an inner wall surface of a building as an ink receiving paper and is used for printing by an inkjet printer, will be described with reference to the drawings. . In addition, in this drawing, it is a schematic cross-sectional explanatory view. For example, the foaming is originally large, and traces of foaming often appear on the surface of the ink image-receiving layer, but the illustration is omitted.

"Layer configuration and layer configuration method of ink receiving paper"
The wallpaper ink-jet ink image receiving paper 100 manufactured by the manufacturing method of the present embodiment whose sectional view is shown in FIG. 1 is obtained by heating and foaming the wallpaper ink-jet ink receiving paper 300 before heating and foaming shown in FIG. It is manufactured by embossing and forming the ink image receiving layer 16 on the surface of the ink jet ink receiving paper 200 for wallpaper before forming the ink image receiving layer on which the concave and convex pattern shown in the cross-sectional view of FIG. 2 is formed. . Each layer to be formed can be formed using a layer forming method common to those skilled in the art.

  The manufactured inkjet ink receiving paper 100 for wallpaper shown in FIG. 1 has a structure of backing member 10 / foamed thermoplastic resin layer 12 / foamed surface adjusting resin layer 14 / ink image receiving layer 16 and has a backing as a base material. The member 10, the foamed thermoplastic resin layer 12 that is heated and foamed to disperse the bubbles in the resin, the foam surface adjustment resin layer 14 mainly composed of the thermoplastic resin, and the ink image receiving layer 16 that receives the ink from the ink jet printer. And have.

  The ink-jet ink image-receiving paper 200 for wallpaper before forming the ink image-receiving layer shown in FIG. 2 has a structure of backing member 10 / foamed thermoplastic resin layer 12 / foamed surface adjusting resin layer 14, and the backing member 10 serving as a substrate. And a foamed thermoplastic resin layer 12 in which bubbles are dispersed in the resin by heating and foaming, and a foamed surface adjusting resin layer 14 mainly composed of a thermoplastic resin. An uneven shape added by embossing is formed on the surface of the thermoplastic resin layer 12, and these form an uneven pattern layer.

  The inkjet ink receiving paper 300 for wallpaper before heating and foaming shown in FIG. 3 has a structure of backing member 10 / unfoamed resin layer 22 / foamed surface adjusting resin layer 14, and the backing member 10 serving as a base material and resin It has an unfoamed resin layer 22 in which a heated foaming agent before foaming is dispersed, and a foam surface adjustment resin layer 14 mainly composed of a thermoplastic resin.

The backing member 10 has a support surface that supports the non-foamed resin layer 22 on the contact surface with the non-foamed resin layer 22, while the inner wall of the building is opposed to the contact surface with the non-foamed resin layer 22. It has the adhesion surface where the adhesive used for adhesion of is applied. The backing substrate 12 can be made of paper, woven fabric, nonwoven fabric, synthetic paper, titanium paper, glass nonwoven fabric, or the like. The paper is preferably flame retardant paper for wallpaper, aluminum hydroxide paper, inorganic paper, or general paper having a basis weight of 50 to 300 g / m ² , desirably 70 to 150 g / m ² . When using a water-soluble resin emulsion as the resin of the unfoamed resin layer 22 and considering expansion and contraction due to the influence of water at the time of emulsion coating, a coating layer that increases water resistance and reduces moisture permeability on at least the surface of the base sheet. It may be provided.

  The unfoamed resin layer 22 is a coating layer in which a thermoplastic resin, a plasticizer, a stabilizer, a foaming agent, a lubricant, an antioxidant, a filler, a surfactant, and the like are mixed. The unfoamed resin layer 22 does not actually need to contain all of the above-mentioned agents, and may have at least a thermoplastic resin and a foaming agent contained therein. The mixing ratio and the like of these mixtures are determined so that a sufficient foaming effect can be obtained under the conditions of temperature and time for heating and foaming. For example, the mixing ratio is determined so that a sufficient foaming state is obtained by heating for several tens of seconds to 2 minutes at a temperature of 180 ° C. to 230 ° C. The unfoamed resin layer 22 containing a mixture in an appropriate ratio according to these conditions is such that the coating film formed by drying the unfoamed resin layer 22 on the backing member 10 to a certain degree of thickness (for example, about 0.3 mm). ) To be applied.

The thermoplastic resin can contain a foaming agent, and a resin that can be formed on the backing member is selected. Aqueous emulsion resin, polyethylene resin, polyacrylic resin, polyvinyl acetate resin, polyurethane resin, polystyrene resin, polyvinyl chloride, synthetic resin rubber and the like can be used. Polyethylene resin is suitable because it has advantages such as less generation of dioxin when burned as waste and less environmental damage. Most preferred is an aqueous emulsion resin. As the water-based emulsion resin, various non-vinyl chloride emulsions can be used, and general ethylene-vinyl acetate, acrylic resin alone or blends, and copolymerization are preferable. The same resin can be used in common for the unfoamed resin layer, the foamed surface adjusting resin layer, and the raised printing layer. In addition to inorganic fillers, pigments, and capsule foaming agents (not included in the foam-adjusting resin layer), various antifoaming agents, thickeners, dispersants, drying retarders, flame retardants Add antiseptics, fungicides, etc. to paint. Various methods such as comma coating, doctor coating, and roll coating can be applied to the emulsion paint. After coating on the base material sheet, for example, drying is performed at 120 ° C. for about 1 minute with a hot air oven dryer to produce an unfoamed base coat raw material. The aqueous emulsion coating amount of the unfoamed resin layer is 50 to 250 g / m ² (when dried), and preferably 80 to 200 g / m ² (when dried).

  A filler that is suitable for obtaining texture and whiteness is selected. As the calcium carbonate and the filler, a flame retardant inorganic filler or a general inorganic filler such as calcium carbonate can be used. In particular, since wallpaper is used for the inner wall of a building, fire prevention performance is necessary, but emulsion resin is particularly suitable because it is flammable. Examples of the inorganic filler having a flame retardant effect include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc borate, zinc oxide, magnesium oxide, inorganic spheres, organic hollow spheres, and barium metaborate. Examples of general inorganic fillers include calcium carbonate, barium sulfate, talc, carion, and clay. The unfoamed resin layer and the foamed surface adjusting resin layer are preferably added with about 50 to 200 parts of filler relative to the resin 100. Further, since smoothness is required for printing, the average particle size is preferably 10 μm or less, and preferably 5 μm or less.

  Plasticizers include phthalate ester, phosphate ester, chlorinated fatty acid ester, chlorinated paraffin, epoxy, polyester, and adipic ester plasticizers such as dioctyl phthalate, dibutyl phthalate, and butyl benzyl phthalate. Can be used.

  As the stabilizer, a stabilizer suitable for controlling the decomposition temperature of the foaming agent, that is, the foaming temperature is selected and selected. Composite stabilizers such as cadmium, barium, and zinc, lead stabilizers, tin stabilizers, calcium stabilizers, and the like can be used.

  The foaming agent may be a heating foaming agent that foams by heating, and either a pyrolytic foaming agent or a capsule foaming agent can be used. As a component of the foaming agent, nitropentamethylenetetramine, azodicarbonamide, toluenesulfonylhydrazine, azobisisobutylnitrile, benzenesulfonylhydrazine and the like can be used. The capsule foaming agent is a microsphere having a particle size of 10 to 30 μm in which a low boiling point solvent is encapsulated with a coating or shell of a thermoplastic polymer material. As the shell material, an acrylonitrile / vinylidene chloride copolymer, an acrylonitrile / acrylic copolymer, a nitrile copolymer or the like is used, and examples of the encapsulated gas include pentane, isopentane, isobutane, and butane. As the capsule foaming agent, a high-temperature foaming agent that can be heated at 140 (160) to 190 ° C. for 1 minute to obtain the maximum magnification, and the shell material is a nitrile copolymer and the inclusion gas is pentane is suitable. is there.

  A lubricant that is suitable for improving the processability of embossing is selected. Polyolefin type, stearic acid, stearic acid ester, stearyl alcohol, petrolatum, polyglycol ester of fatty acid and the like can be used.

  A surfactant is selected that is suitable for emulsifying a thermoplastic resin. Phosphoric acid monoester, phosphoric acid diester, polyoxyethylene sorbitan monooleate, polyoxyethylene lauryl ether, polyethylene glycol monolaurate and the like can be added.

For the foam surface adjustment resin layer 14, a general thermoplastic resin containing no foaming agent can be used. A water-soluble resin emulsion is preferable, and a water-soluble urethane emulsion is more preferable. When a water-soluble urethane emulsion is used together with the ink image receiving layer 16, the ink image receiving layer 16 and the foamed surface adjusting resin layer 14 are in close contact with each other, and the adhesiveness is improved. In order to increase the volume as a whole, it is preferable that the coating amount is small. However, if the coating amount is too small, the surface of the foamed resin layer is destroyed due to the influence of the surface exposure of bubbles during foaming. The coating amount is 1 to 20 g / m ² , preferably ² to 10 g / m ² . The method of coating the foam surface adjustment resin layer 14 is the same as that for the non-foam resin layer, but the non-foam resin layer and the foam surface adjustment resin layer are wet in addition to coating the non-foam resin layer after forming the dry film. It is also possible to dry after stacking two layers in the state.

Ink image-receiving layer 16 is formed by applying a polyurethane resin component, at least the fine particles of silica fine particles and alumina fine particles, at a coverage of 15g ^/ m ² ~35g / m 2 of an aqueous emulsion-like paint containing. Here, the aqueous emulsion means a paint having a solid content of 15 to 30% and water of 70 to 80%.

  The reason why at least one of silica fine particles and alumina fine particles is included is that the ink image receiving layer 16 is in a porous state, but is not limited to this reason. That is, the ink image receiving layer 16 is formed in a mode suitable for ink jet printing. Examples of inks produced by inkjet printers include dye inks and pigment inks. For example, when pigment inks are used, they are in a porous state that absorbs the solvent of the pigment ink and keeps the pigment particles from falling off. It is preferable. In particular, the ink image receiving layer 16 preferably has a pore size of 1 to 30 μm and a pore volume ratio of 20 to 70%.

  A polyurethane resin is used as a resin component constituting the ink image receiving layer 16. The reason why it is used may be that the adhesiveness with the foamed surface adjusting resin layer 14 is improved when it is a polyurethane resin. The reason for this improvement in adhesion can be considered by way of example. By using a urethane-based resin, a urethane resin having a high internal cohesive force due to the urethane bond is superior to an acrylic resin, for example. It can be considered that the compatibility with the foamed surface adjusting resin layer 14 is preferable because it contributes to the improvement of adhesion by hydrogen bonding or the like, but is not limited to the cause of this consideration.

  The urethane resin is preferably a two-component curable type from the viewpoint of enhancing physical properties such as water friction resistance and bendability as the layer. The two-component curable urethane resin is a urethane resin having a polyol as a main component and an isocyanate as a crosslinking agent (curing agent). The polyol is a compound having two or more hydroxyl groups in the molecule. For example, polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, polyurethane polyol, or the like is used. As the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in the molecule is used. For example, aromatic isocyanate such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4'-diphenylmethane diisocyanate, or 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, etc. Aliphatic (or alicyclic) isocyanates are used. Moreover, you may use the said adduct or multimer of said various isocyanate, for example, the adduct of tolylene diisocyanate, tolylene diisocyanate trimer (trimer), etc.

  Such a porous ink image-receiving layer 16 is produced by applying and drying a liquid in which fine particles such as silica and alumina, alone or mixed, are dispersed in a polyurethane resin. The ink image receiving layer 16 can have an appropriate film thickness in this dry state. Here, the film thickness can be determined by comparative consideration of the balance between the ease of ink image reception and the film thickness that can properly represent the concavo-convex pattern layer when embossing is performed. For example, when it is desired to highlight a concavo-convex pattern, it is possible to adopt a mode in which the thickness is a thin layer of about 5 to 25 μm.

  As a printing method for printing the water-based emulsion paint, various printing methods such as comma coat, gravure, offset, flexo, and silk can be applied. The ink image receiving layer 16 may be provided with a transparent coating layer on its surface for gloss adjustment, and various paints can be used regardless of whether they are solvent-based or water-based. Examples of matting agents include silica, alumina, calcium carbonate and the like. The concavo-convex pattern layer is usually formed also on the surfaces of the foamed surface adjustment resin layer 14 and the foamed resin layer 12, but the concavo-convex pattern layer is also formed only at least on the foamed surface adjustment resin layer 14 in this embodiment. Can be implemented.

"Foam manufacturing process"
A process of manufacturing the inkjet image receiving paper 100 for wallpaper through the inkjet image receiving paper 200 before forming the image receiving layer using the inkjet image receiving paper 300 before heating and foaming will be described.

  In the inkjet image receiving paper 300 before heating and foaming shown in FIG. 1, the unfoamed resin layer 22 is first heated by the heating process, and the heating foaming process in which the heated foaming agent in the unfoamed resin layer 22 is foamed by heating. The foamed thermoplastic resin layer 12 is formed. After the heating and foaming step, the surface of the foamed thermoplastic resin layer 12 is embossed to form a concavo-convex pattern, and the inkjet image receiving paper 200 for wallpaper before the ink image receiving layer 16 is formed is manufactured. In addition, in the manufacturing process including the concavo-convex pattern layer forming step such as embossing, the concavo-convex pattern layer forming step is not an indispensable step, and the present embodiment can be implemented even if omitted. is there. It is preferable to perform embossing, for example, when a capsule foaming agent is used, large bubbles may be generated due to sudden foaming in the foaming process, and it is difficult to ensure the uniformity of the bubbles. Such as the case. The concept of embossing in this case is not limited to shaping irregularities, but also includes the concept of pressing with a relatively flat roll or a roll engraved with satin.

  What is necessary is just to use the apparatus etc. which can heat-foam the heating foaming agent in the unfoamed resin layer 22 for a heating foaming process. For example, a heating oven can be used. Inkjet image-receiving paper 200 before being heated and foamed is introduced into the heating oven and heated internally, and then continuously heated at a temperature of 180 ° C. to 230 ° C. for several tens of seconds to 2 minutes. The resin layer 22 is heated and foamed. By this heating, the unfoamed thermoplastic resin layer 22 becomes a foamed resin layer having a thickness of about 3 to 5 times.

  The embossing can use a general process that can add an uneven pattern to the surface. For example, a heated embossing roller or embossing plate can be heated and pressed from the ink image receiving layer 16 side to add a concavo-convex shape to the surface to form a concavo-convex pattern layer. That is, in the embossing process, it is easy to match a large number of holes dispersed in the foamed resin layer 12 below the foamed surface adjusting resin layer 14 generated by heat foaming with the unevenness of the embossing roller or the embossing plate. The ink-jet image-receiving paper 200 for wallpaper before forming the ink image-receiving layer in which the uneven pattern is faithfully transferred is manufactured. If an uneven pattern can be formed, embossing is not necessary.

The ink-jet image receiving layer 16 is formed on the surface of the ink-jet image receiving paper for wallpaper 200 before the ink image-receiving layer is formed, and the ink-jet image receiving paper for wallpaper 100 is manufactured. A pigment ink is jetted onto the surface of the ink image receiving layer 16 of the ink jet image receiving paper 100 for wallpaper using an ink jet printer in a pattern that becomes a wallpaper pattern, and the ejected pigment ink is taken into the ink image receiving layer 16 to be a required pattern. Form.

  By using the ink-jet image receiving paper 100 of the present embodiment, it is possible to improve printing suitability, adhesion, and bendability.

  Evaluation of printing appropriateness, adhesion, and bending characteristics was performed by comparing the inkjet image receiving paper for wallpaper (foamed embossed type) manufactured according to this embodiment (example) with the conventional inkjet image receiving paper for wallpaper (comparative example). . The results are shown in Table 1.

「製造方法」
「実施例１」
裏打ち紙にＥＶＡ（エチレンー酢酸ビニル共重合体）がコーティングされている原反に、コンマコートもしくはロールコートにて下記組成Ａを５ｇ／ｍ^２でドライコートして発泡面調整樹脂層を形成した。

"Production method"
"Example 1"
A foamed surface adjusting resin layer was formed by dry-coating the following composition A at 5 g / m ² by comma coating or roll coating on an original fabric coated with EVA (ethylene-vinyl acetate copolymer) on the backing paper.

<Composition A>
A polyurethane resin comprising 99% polyurethane resin and 1% nonionic surfactant, and an aqueous emulsion coating liquid in the form of an aqueous emulsion (solid content 10 to 20%, water 80 to 90%) at the time of coating.

After providing this foaming surface adjusting resin layer, it was heated and foamed at 170 ° C. for 1 minute in a foaming furnace, and then embossed with an infrared heater at a surface temperature of 170 to 200 ° C. Thereafter, an ink image-receiving layer was formed on the composition B at a rate of 15 g / m ² by comma coating.

<Composition B>
Polyester polyol two-part curable urethane resin (including curing agent) 100 parts by weight, microsilica 50 parts by weight, and aqueous emulsion (solid content 15-30%, water 70-80%) in the form of coating Coating liquid.

"Example 2"
Example 2 differs from Example 1 only in the coating amount of the composition B. In Example 2, after embossing, an ink image-receiving layer was formed on the composition B by comma coating at 25 g / m ² .

"Example 3"
Example 3 differs from Example 1 only in the coating amount of the composition B. In Example 2, after embossing, an ink image-receiving layer was formed on the above composition B with a comma coat at 35 g / m ² .

“Comparative Example 1”
Comparative Example 1 differs from Example 1 only in the coating amount of Composition B. In Example 2, after embossing, an ink image-receiving layer was formed on the composition B with a comma coat at 10 g / m ² thereon.

“Comparative Example 2”
Comparative Example 2 differs from Example 1 only in the coating amount of Composition B. In Comparative Example 2, after embossing, an ink image-receiving layer was formed on the composition B with a comma coat at 40 g / m ² thereon.

"Evaluation methods"
・ As for proper printing, Epson's MC-9000, Roland DG's "FJ500", and Hewlett Packard's "DJ5000PS UV" are used for printing and evaluated for image clarity and ink bleeding. Went.

  The evaluation criteria for proper printing are as follows.

◎: Image sharpness and ink bleeding are very good ○: Image sharpness and ink bleeding are good △: Image sharpness and ink bleeding are defective ×: Image There is a defect in both the sharpness and the ink bleed. ・ For adhesion, paste the cello tape (registered trademark) (manufactured by Nichiban Co., Ltd.) so that air does not enter, and rub it 10 times with a squeegee to print the received image. The film was brought into close contact with the surface of the layer and immediately peeled off from the printed image-receiving layer surface at an angle of 45 degrees, and evaluated by whether or not the foamed resin layer or the ink image-receiving layer was peeled off due to cohesive failure.

  The evaluation criteria for adhesion are as follows.

○: Little or no △: Peeling occurs partly ×: Peeling occurs over the entire surface ・ For folding characteristics, 180 ° or 90 ° with the printed image-receiving layer surface side as the peak side It was bent and evaluated.

  The evaluation criteria for the bending characteristics are as follows.

◎: Cracks in the printed part (white area of the background) are hardly noticeable ○: Cracks in the printed part (white area of the background) are inconspicuous △: Cracks in the printed part (white area of the background) are conspicuous ×: Cracks in the printed part (white area of the base) are noticeable. “Results and Discussion”
In each of Examples 1 to 3 and Comparative Examples 1 and 2, appropriate adhesion can be secured. Here, in Examples 1 to 3, it was possible to obtain very good characteristics both for printing and for bending.

It is sectional drawing of the manufactured inkjet ink image-receiving paper for wallpaper. It is sectional drawing of the inkjet ink receiving paper for wallpaper before ink image receiving layer formation. It is sectional drawing of the inkjet ink image-receiving paper for wallpaper before foaming formation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base material sheet 12 Foamed resin layer 14 Foamed surface adjustment resin layer 16 Ink image receiving layer 22 Unfoamed resin layer 100, 200, 300 Ink image receiving paper

Claims (3)

A base sheet, a foamed resin layer formed by foaming by heating a heating foaming agent contained in the thermoplastic resin layer, a foam surface adjustment resin layer mainly composed of a thermoplastic resin, and an ink image. A method for producing an ink image-receiving paper comprising an ink image-receiving layer,
An unfoamed resin layer forming step of forming an unfoamed resin layer before heating and foaming on the base sheet;
A foamed surface adjusting resin layer forming step of forming the foamed surface adjusting resin layer on the unfoamed resin layer after forming the unfoamed resin layer;
A foamed resin layer forming step of forming a foamed resin layer by heating the heating foaming agent in the unfoamed resin layer after the foamed surface adjustment resin layer is formed,
An image receiving layer forming step of forming an ink image receiving layer for receiving ink on the foam surface adjustment resin layer after forming the foamed resin layer;
Creating an aqueous emulsion-like paint comprising a polyurethane resin component and at least one of silica fine particles and alumina fine particles;
Method for producing an ink image-receiving sheet to form the ink image-receiving layer by coating with the aqueous emulsion-like coating with a coating weight of ^{15g / m 2 ~35g / m 2} . It is a manufacturing method of the ink image-receiving paper according to claim 1,
An ink receiving paper including a concavo-convex pattern layer forming step of forming a concavo-convex pattern layer by forming a concavo-convex shape at least on the surface of the foam adjustment resin layer after forming the foamed resin layer and before forming the ink image-receiving layer. Production method. A method for producing an ink-receiving paper according to claim 1 or 2,
A method for producing an ink image-receiving paper, comprising an embossing step of embossing at least the surface of the foam-adjusting resin layer after forming the foamed resin layer and before forming the ink image-receiving layer.

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